Incorporate portability recommendations by Ralf Wildenhues

	<ralf.wildenhues@gmx.de>

	* pdfroff.sh: Avoid unsafe quoting in variable substitutions of
	the form "${VAR+"set"}"; remove outer quotes everywhere; prefix
	with `x' on each side of comparisons.
	($NULLCMD): Define when `$ZSH_VERSION' is set, i.e. when host
	has `/bin/sh -> zsh'; also...
	(emulate sh): Invoke, for this case.

	Enhancement/bug fix requested by Werner LEMBERG <wl@gnu.org>

	* pdfroff.sh (--help): Direct output to `stdout', not `stderr'.
	(--keep-temporary-files): New option; implement it.

	* pdfroff.man (OPTIONS): Document `--keep-temporary-files' option.
	(FILES): Note names and purpose of files it affects.

	* Makefile.sub (PDFROFF): Add `--keep-temporary-files' option;
	retain them in `GROFF_TMPDIR=.'.
	(CLEANADD): Include temporary files matching `pdf[0-9]*'.

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